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   8 <title>logresolve - Resolve IP-addresses to hostnames in Apache
   9    log files - Apache HTTP Server</title>
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  16 <p class="apache">Apache HTTP Server Version 2.3</p>
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  20 <a href="http://www.apache.org/">Apache</a> &gt; <a href="http://httpd.apache.org/">HTTP Server</a> &gt; <a href="http://httpd.apache.org/docs-project/">Documentation</a> &gt; <a href="../">Version 2.3</a> &gt; <a href="./">Programs</a></div><div id="page-content"><div id="preamble"><h1>logresolve - Resolve IP-addresses to hostnames in Apache
  21    log files</h1>
  22 <div class="toplang">
  23 <p><span>Available Languages: </span><a href="../en/programs/logresolve.html" title="English">&nbsp;en&nbsp;</a> |
  24 <a href="../ko/programs/logresolve.html" hreflang="ko" rel="alternate" title="Korean">&nbsp;ko&nbsp;</a></p>
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  26
  27      <p><code>logresolve</code> is a post-processing program to
  28      resolve IP-addresses in Apache's access logfiles.  To minimize
  29      impact on your nameserver, logresolve has its very own internal
  30      hash-table cache.  This means that each IP number will only be
  31      looked up the first time it is found in the log file.</p>
  32
  33      <p>Takes an Apache log file on standard input.  The IP addresses
  34      must be the first thing on each line and must be separated from
  35      the remainder of the line by a space.</p>
  36 </div>
  37 <div id="quickview"><ul id="toc"><li><img alt="" src="../images/down.gif" /> <a href="#synopsis">Synopsis</a></li>
  38 <li><img alt="" src="../images/down.gif" /> <a href="#options">Options</a></li>
  39 </ul></div>
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  41 <div class="section">
  42 <h2><a name="synopsis" id="synopsis">Synopsis</a></h2>
  43
  44      <p><code><strong>logresolve</strong> [ -<strong>s</strong>
  45      <var>filename</var> ] [ -<strong>c</strong> ] &lt;
  46      <var>access_log</var> &gt; <var>access_log.new</var></code></p>
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  48 <div class="section">
  49 <h2><a name="options" id="options">Options</a></h2>
  50
  51 <dl>
  52
  53 <dt><code>-s <var>filename</var></code></dt>
  54
  55 <dd>Specifies a filename to record statistics.</dd>
  56
  57 <dt><code>-c</code></dt>
  58
  59 <dd>This causes <code>logresolve</code> to apply some DNS checks:
  60 after finding the hostname from the IP address, it looks up the IP
  61 addresses for the hostname and checks that one of these matches the
  62 original address.</dd>
  63
  64 </dl>
  65 </div></div>
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  67 <p><span>Available Languages: </span><a href="../en/programs/logresolve.html" title="English">&nbsp;en&nbsp;</a> |
  68 <a href="../ko/programs/logresolve.html" hreflang="ko" rel="alternate" title="Korean">&nbsp;ko&nbsp;</a></p>
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  70 <p class="apache">Copyright 1995-2005 The Apache Software Foundation or its licensors, as applicable.<br />Licensed under the <a href="http://www.apache.org/licenses/LICENSE-2.0">Apache License, Version 2.0</a>.</p>
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